Method for presetting process dimension according to deformation quantity before spherical surface heat treatment of bevel planet gear

Abstract

The invention discloses a method for presetting process dimension according to deformation quantity before spherical surface heat treatment of a bevel planet gear, which can be carried out in the following sequences that: 1, the spherical surface is precisely processed to the designed dimension SR; 2, the actual spherical surface dimension is measured according to codes, and the actual measurement results are recorded; 3, heat treatment is carried out according to conventional process parameters; 4, the actual spherical surface dimension is measured according to the codes after the heat treatment, and the actual measurement results are recorded; 5, a deviation value is calculated through comparing the actual spherical surface dimensions before and after the heat treatment; and 6, the process dimension of the spherical surface precise machining before the heat treatment is determined according to the actual measurement deviation value. The method is simple and convenient, the presetting process dimension is accurate, the spherical surface directly carries out the heat treatment after being precisely processed according to the process dimension, the heat treatment deformation is used for offsetting the presetting deformation quantity in the process dimension, and the design dimension SR can be reached without milling machining after the heat treatment, so the production efficiency is improved. More importantly, a surface hardened layer formed after the spherical surface heat treatment is prevented from being ground, the wear-resistance performance of the spherical surface is ensured, and the conditions are created for prolonging the service life of the bevel planet gear.

Description

technical field [0001] The invention relates to a method for presetting process dimensions according to deformation amount before heat treatment of mechanical parts. Specifically, the invention relates to a method for preset process size according to deformation amount before heat treatment of a planetary bevel gear spherical surface. Background technique [0002] The automobile differential is a special device to solve the different speeds of the wheels on both sides when turning, and the planetary bevel gear is one of the key parts. The size of the planetary bevel gear is small, the structural elements are highly integrated, the technical requirements are particularly high, and the manufacturing is difficult. The spherical surface of the planetary bevel gear is located on the back of the bevel gear, and the spherical surface is directly matched with the adjacent parts. Under normal circumstances, the spherical surface radius tolerance is ±0.05mm, and the spherical surface ...

AI Technical Summary

Problems solved by technology

However, the existing technology has two major practical problems in the industrial production process, which seriously restrict the production efficiency and service life of planetary bevel gears.

First of all, the grinding process is inefficient and not suitable for mass production

Another problem is that grinding after heat treatment will inevitably grind off the surface hardened layer obtained by heat treatment on the spherical surface, and the loss of the spherical surface hardened layer will directly reduce the service life of the planetary bevel gear

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